Re: [Xen-devel] Linux'es free_initmem() on Xen

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 02.02.16 at 14:30, <david.vrabel@xxxxxxxxxx> wrote:
> On 02/02/16 12:44, Jan Beulich wrote:
>> All,
>> 
>> while looking into some of the DEBUG_WX issues I came across
>> aforementioned function and started wondering how pv-ops gets
>> away without the unmapping XenoLinux has always been doing
>> (in free_init_pages()).
> 
> Um.  I'm not sure why you think something needs to be unmapped.  This is
> freeing the pages back to the page allocator -- thus the pages still
> need to be mapped.

In the 1:1 mapping, yes. But the secondary mapping in the kernel
VA range is not needed anymore, and (unless accounted for) would
get in the way of said operations.

Jan


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